Cylinder-boring attachment for lathes.



W. AAB. CYLINDER BORING ATTACHMENT FOR LATHES.

APPLICATION FILED ocT.2o.1911.

Patented Feb. 25, 1919.

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'n 'iN-QQ www WILLIAM AAB, F rNIEUW' ULM, MINNESOTA.

CYLINDER-BORING ATTACHMENT FOB. LATHES.v

Application filed October 20,

To all whom z't may concern.'

Be it known that I, WILLIAM AAB, a citizen of the Un-ited States, residing at New Ulm, in the county of Brown and State of Minnesota, have invented certain new and useful Improvements in Cylinder-Boring Attachments for Lathes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artl to which it appertains to make and use the same. *I

My invention has for its object to provide an extremely simple and highly efficient cylinder boring attachment for lathes; and, to this end, it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings,

Figure 1 is a view, partly in front elevation and partly in longitudinal central section, showing a standard lathe having the improved attachment applied thereto and adjusted for use in centering a cylinder on the face plate, prior to the boring thereof.;

Fig. 2 is 4a view, partly in elevation and partly in transverse vertical section taken yon the line 2-2 of Fig. 1, .on an enlarged scale, with the attachment adjusted for use in boring a cylinder; i

Fig. 3 is a detail view in central vertical section taken von the line 3 3 of Fig. 2;

Fig. 4 is a detail view, with some parts sectioned on'the line 4 4 of Fig. l, on an enlarged scale;

Fig. 5 is a detail view, principally in plan, y' of the parts shown in Fig. 4; and

Fig. 6 is a fragmentary detail view, illustrating the shape of the teeth ofthe boring tool and the cut made thereby in boring'a cylinder. i

Of the parts of the standard lathe illustrated, it is only necessary, for the purpose of this case, to note the bed 7, head stock 8, spindle 9, carrier 10, and tool post 11.

Referring now in detail to the improved y boring attachment, the numeral 12 indicates a cast frame resting on the bed 7, in place of the customary tail stock, and detachably but rigidly secured thereto by ,long nutequipped bolts 13 and coperating tie bars 14. In the top o f the frame l2, is a pair Specification of Letters Patent.

Patented Feb. 25, 1919. 1917. Serial No. 197,733.

ofA axially alined bearings 15 having adjustable caps 16. To the outer end of the frame 12, is detachably secured a vertical face plate 17 having an annular opening 18 that is in axial alinement with the bea-rings 15. Clamps 19, for detachably securing an engine casing Z to the outer surface of the face plate 17, with one of its cylinders in axial alinyement with the opening 18, are adjustably secured to the face plate 17 by nut-equipped bolts 20 passed through certain of the multiplicity of bores 21 in said face plate.

wA three-section shaft or boring bar, the

sections of which are indicated Iby the nu merals 22, 23 and 24, has its end section 22 mounted in the spindle 9, with freed'om for axial sliding movement. This shaft section 22 is secured to the :spindle 9 for rotation therewith, but with freedom foraxial sliding movement, by a clutch 25, having a key 26 mounted in a long key-way 27 formed in said shaft section. The ends of the key 26 have lugs or lips which engage opposite shoulders on the clutch 25 and hold the same against endwise movement. Obviously, the shaft section 22 holdsthe key 26 interlocked with the clutch 25. By removing the sha-ft section 22. from the spindle 9, the key 26 may readily be detached from the clutch 25.

The intermediateshaft section 23 is connected vto the 4end sections 22 and 24 thereof by universal joints 28. The end shaft seetion 24 is journaled in the bearings 15, with freedoni'for axial'sliding movement. The

outer end of the shaft section 24 is reduced to form a shoulder 29 and a screw-threaded stud 30 for detachably holding a tool thereon. For centering a cylinder on the face plate 17, I provide a centering head 31, in the form of a washer, having internal screw threads, ,adapting'the same to be screwed onto the stud 30. This centering head 31'is of such size as to snugly fit within one of the cylinders of the engine casing Z and il support said Vcasing with the respective cylinder center or, in other words, with the said cylinder in axial alinement with the end shaftsection 24. With the engine casing Z supported on the centering head 3l, the

same may be rigidly secured to the face plate 17 by clamps 21.

Axial movement is impartedr to the shaft,

for feeding the outer end of its section 24 through the opening 18 in the face plate 17 centering position, as shown in Fig. 41.

" 'After the casing Z Fig. 6. Ai-the completion of the lathe to drive the shaft and has been securely' clamped onto the face plate 17, the vcarrier 10 is reversed'to return the centering head 31 to itsI full line position. 'The centering head 31 is then removed, and a boring tool 34, of novel construction, substituted therefor. The carrier v10 is then set in motion to feed the boring tool 34 into the cylinder and a cut is made thereby, asindicated in this cut, the carrier 10 is reversed to removethe boring tool 34 from the cylinder. During theremoval of the boring tool 34 from the cylinder, the same is continuously rotated and a final cut is made to smooth up the Erst cut.v From the above description, it is evident that by providing the attachment with a` jointed shaft, it is not necessaryto have the'A end shaft section 24 axially alined with the bed 7, without reference to'said spindle. With this construction, it is possible to very quickly apply the attachment to a standard lathe, or remove the same therefrom. It is also evident that' by utilizing certain of the movable parts of impart axial movement thereto, avery simpleand yet efflcient cylinder boring attachment is produced. The boring tool34, shown in the draw.- `ings, is in the form of a flat disk having an axial openingl with internal screw threads that adapt the tool to be' secured to the stud 30. The periphery of this boring tool 34 is cut to form a plurality of teeth 35 that are axially s yaced unequal distances apart to prevent c atter. By reference to Fig.. 6, it will be noted that the ends of each tooth 34 `are beveled and the intermediate ortion thereof'isf slightly-rounded. T hese beveled ends .of the teeth 35 make the first and heavy'. vpart of-.the cut,

mediate portions thereof inake the finished f, its..

cut. While; only the vou-ter beveled endsof the-teeth 35 do'the act-ual cutting, the inner" extremities thereof permittheboring'- tool to readily. enter a cylinfreelyv move therein in either direclportions of the By Qireiimieetiaiiy piangere teeth 35 unequal distances apart, chattering of` the tool isentirelyovercome, for lthe reason that w-ork at a different point.

out of a cylinder secured .to the fra-me. lathe spindle 9, thus permitting the frame 12 to be clamped ontothe shaft may be rier for' moving the lconnection while the rounded inter#A 'aXi'ally a cylinder secured,v to the frame,

,alinement with the lathe spindle. .f 4. The ,combination with a lathe,.

- frame on each successive tooth strikes the cylinder or In case the teeth 35 vwere spaced equal distances apart, they would strike the cylinder at given points, thereby making` ridges and causing the tool to chatter.

As the teeth'35 c ircumferentially engage the cylinder,

at la multiplicity of points, the tool 34 is 'firmly held to its work against radial movement. When a single cutting cylinder, the same is liable to spring and pass `over said hard spot, thereby making the surface of thejcylinderuneven. It is, of course, understood that it will be necessary to furnish. a plurality' of centering heads 31 and sizes to it cylinders sizes. 1 By the use of-the cylinder boring attachment, it is possible to .tool is used and engagesa hard spot in the boring tools 34 of different of various different above describedbore a cylinder very accurately, and an experienced machinist is not necessary.

What I claim is i; The -eombinaion with' a iath9, of a cylinder 'boring attachment comprisin .ag

framefor supporting a cylinder', a sha a tool carried lby the shaft, and connections whereby the shaft may be driven from the lathe .spindle andv moved axially bythe lathe v tool carrier for moving the tool into an 2. The combination 'with a lathe,` of a cylinder frame for supporting a cylinder,

a sectional shaft havinig a universal Joint, a `toolcarried by the sha t,

driven from and moved axially ment, -a-chuck connecting the shaft taf hev therewith, and a f between 'the.lathe vtool carrier lathe spindle for rotation and shaft, whereby the shaft may bemov for feeding the tool -int'o and out, of

the tool carrying sections of the 'shaft being out `[of of; a cylinder boring attachment comprising a to which a cylinder may section shaft and universal-joints connecting the sections thereof, one. of the end sections lboring attachment comprising a and connections whereby the.

' the lathe spindle .by .the lathe tool cartool into and out of aj the lathe bedhaving a" face plate'. be Asecure d,a three-l .of 'the shaft being mounted in the lathe spindle with freedom for aXial movement but held for rotation therewith, the otherl of said end sections being journaled on the frame and carrying a tool, and a connection between the lathe tool carrier and shaft, whereby the shaft may be moved axially to carry the centering head into and out of a cylinder secured to the face plate, the tool carrying sect1 alinement with the lath In testimony whereof in presence of two witnesses.

"on of the shaft being out of 10 e spindle.

I affix my signature WILLIAM AAB.

Witnesses 

